Valve-motion for rock-drills.



L. C. BAYLES.

VALVE MOTION FOR ROCK DRILLS.

APPLICATION FILED FB.1,1910.

993,014, Patented May 23, 1911.

lll'lllllll I 1 WW iz m' wiw UNITED STATES PATENT OFFICE.

LEWIS C. BAYLES, 0F JOHANNESBURG, TRANSVAAL, ASSIGNOR T0 INGERSOLL-RANDCOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

VALVE-MOTION FOR ROCK-DRILLS.

To all whom it may concern:

Be it known that I, LEWIS C. Barnes. a citizens of the United States,and resident of Johannesburg, Transvaal, have invented a new and usefulValve-Motion for Rock- Drills, of which the following is aspecification.

This invention relates to a valve motion for rock drills and has for itsobject to provide certain improvements in the construction, form andoperation of the valve mechanism whereby a valve may be employed whichis very simple in construction, positive in its action and which has avery slight movement to accomplish the alternate opening and closing ofthe inlet and discharge passages for the opposite ends of the pistonchamber, the action of the valve being automat-ic.

A practical embodiment of my invention is represented in theaccompanying drawings, in which- Figure 1 represents in longitudinalcentral section so much of a rock drill as will give a clearunderstanding of my invention, Fig. 2 is a section taken in the plane ofthe line A-A of Fig. 1, looking in the direction of the arrows, Fig. 3is a top plan view of the cylinder, the valve chest being shown inhorizontal section taken in the plane of the line B-B of Fig. 1, andFig. 4 is a detail view similar to Fig. 3, with the valve in itsposition opposite to that shown in Fig. 3.

The cylinder of the rock drill is denoted by 1 and its piston by 2.

The valve chest is denoted by 3, which valve chest is provided with amotive fluid inlet chamber 4. Slots, intersecting at right angles in thevalve chest, from four branches 5, 6, 7, 8. A valve 9, 10, 11, 12, isfitted to reciprocate in a right line, its rear and front branches 10and 12 being fitted to slide in the slot branches 6, 8, and its wings 9,11, being located in the slot branches 5, 7 and have a limited movementfrom side to side thereof. The slot branch 7 opens to externalatmosphere and forms the exhaust chamber. The opposite faces of thevalve wing 9 are arranged to open and close ports 13, 14, of inletpassages 15, 16, leading to the front and rear ofthe cylinder chamber,respectively. The opposite faces of the valve wing 11 are fitted to openand close ports 17, 18, of exhaust passages 19, 20, leading from thefront and back of the cylinder chamber.

Specification of Letters Patent.

Application filed February 1, 1910.

Patented May 23, 1911.

Serial No. 541,289.

Prcsupposing the parts to be in the position shown in Figs. 1, 2 and 3,with the piston 2 traveling in the direction shown by the arrow thereon,the wing. t) of the valve has opened the motive fluid inlet passage 16to the back of the cylinder chamber and closed the motive lluid passage15 to the front of the chamber and, at the same time, has opened thedischarge passage 19 leading from the front end of the cylinder toexternal atmosphere and closed the exhaust pas sage 20 leading from therear end of the cylinder chamber. As the piston 2 nears the limit of itsforward movement, it will first close the discharge passage 19 and forthe balance of its forward movement will compress the motive fluid inletpassage 15 sufficiently to throw the valve over into the position shownin Fig. 4, thus opening the motive fluid inlet passage 15 to the maininlet chamber 4 and close the motive fluid inlet passage 16 and, at thesame time, open thedischarge passage 20 and close the discharge passage19. This will cause the piston to start on its return movement and as itnears the limit of its return movement, it will first close thedischarge passage 20 and then compress the fluid sufficiently in theinlet passage 16 to throw the valve back into the position shown inFigs. 1, 2.:tnd 3.

It will thus be seen that the valve and ports, constructed and arrangedas herein set forth, permits the valve to control the opening andclosing, not only'of the inlet passages but also of the dischargepassages so as to insure a sufiicient overbalancing of pressure upon thevalve wings to throw the valve automatically at the desired times toinsure the proper reciprocation of the piston.

While I have shown this valve mechanism in connection with a rock drill,it is to be understood that I do not wish to limit myself to such usebut contemplate its use wherever applicable in percussive machines ortools.

What I claim is 1. A cylinder having independent inlet and dischargepassages for both ends thereof, its piston, a valve chest and a valvereciprocating in a right line and having valve wings arranged to controlboth the inlet and discharge passages.

.2. A cylinder having independent inlet and discharge passages for bothends there- 4. A cylinder, itspiston and a valve recip rocating in aright line and having a pair of wings, said cylinder having independentinlet and discharge passages for both ends thereof leading to theopposite faces of said valve Wings.

5. A cylinder, its piston, a valve reciprocating in a right line andhaving a pair of Wings, said cylinder having independent inlet anddischarge passages for both ends thereof, the inlet passages leading tothe opposite faces of one valve Wing and the outlet passages leading tothe opposite faces of the other valve Wing.

6. A cylinder, its piston, a valve chest, independent inlet anddischarge passages for both ends of the cylinder having ports openinginto the valve chest and a valve reciprocating in a right lineperpendicular to the faces of the ports for opening and closing thesame.

In testimony, that I claim the foregoing as my invention, I have signedmyname in presence of two Witnesses, this 26th day of January 1910.

LEWIS QBAYLES. Witnesses:

F. GEORGE BARRY, C. S. SUNDGREN.

